#include <stdio.h>

void exchange(int *num1,int *num3){
    int num2;
    num2 = *num1;
    *num1 = *num3;
    *num3 = num2;
    printf("num1 = %d , num3 = %d\n",*num1,*num3);
}
int main(){
    int m = 5;
    int n = 10;
    exchange(&m,&n);
    printf("m = %d , n = %d",m,n);
}